According to a survey of many protected examples of birds from an assortment of exhibit halls around the planet, there is a special arrangement of plume rules behind the power of flight.
These newfound principles make it easier for researchers to predict which dinosaurs could also fly.
"Theropod dinosaurs, including birds, are perhaps among the best vertebrates on our planet," says scientist Jingmai O'Connor of the Field Exhibition hall. "One of the reasons they're so effective is their flight. One of the different reasons is probably their plumes, because there are such adaptive patterns."
Their new information could settle several long-standing paleontological debates about whether dinosaurs re-evolved flight.
Periodic History ornithologist Yosef Kiat's field exhibit found a fascinating pattern when inspecting the wings of 346 unique bird species from historic centers around the planet. From the smallest hummingbird to the wildest falcon, all flying birds have 9 to 11 winged wings called primaries.
A chart of bird wing life structures with the basic quills named
Yet the amount of plumes required in flightless birds has varied enormously. Emus absolutely need them, while penguins can get extravagant with 40.
"It's really amazing that with so many flight styles that we can find in modern birds, they all offer this attribute of having somewhere between nine and eleven basic plumes," says Kiat. “What's more, I was amazed that no one had found it before.
The number of primaries, together with the evenness of plumage and wing span, accurately reflect the flight limits of all known contemporary birds.
By looking at fossils up to 160 million years old, experts recognized which bird precursors shared these characteristics and were thus predisposed to have the ability to fly. Of the 35 different types of extinct birds, Kiat and O'Conner recognized a few that had the right quills for flight and others that didn't.
Reasonable flyers include Archeopteryx, which is considered one of the earliest bird-like creatures. While the actual link between Archeopteryx and birds is teased, small four-winged dinosaurs called Microraptors also had these traits, despite not being directly related to birds.
"Recently, scientists realized that birds were apparently not the only flying dinosaurs," opines O'Connor.
Curiously, Caudipteryx had the correct number of quills necessary, but they were completely aligned, "more than likely" ruling out flight. Specialists believe that Caudipteryx's precursor was ready for flight, but the species has since lost this capacity.
"Our results here strongly suggest that flight just evolved in dinosaurs," says O'Connor.
Their examination shows the life structures expected to have evolved in the animal groups inherited from each of these pennaraptoran clusters before they spread. Some, like Caudipteryx, became flightless from the start. Those like the Microraptors maintained their flight, yet reached a transformational impasse. Others became the birds of today.
Kiat and O'Connor make the case that advanced flight in dinosaurs many times depended solely on bone information.
"We argue that it is difficult to assess flight potential in non-avian pennaraptorans without looking at the design of the quills forming the actual wing," they write in their paper.
They admit that we are actually missing the earliest stages of wing development from our fossil record, so this is unlikely to be the last word in the debate.
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